Lamp reflector



April 26, 1927. N. LANG i LAMP REFLECTOR Original Filed May 14. 1923 2 Sheets-Sheet 1 April 26. 1927. r 1,625,948

N. LANG- LAMP REFLEC'EOH Original Filed May 14. 1923 2 Sheets-ShaetZ N) It? l NVENTOR N181: L rag B3 Aflorngg.

- lam Patented Apr. 26, 1927.

UNITED STATES PATENT OFFICE.

NIEL$ LANG, OF VANCOUVER, BRITISH COLUMQIA, CANADA, ASSIGNOB 'IO LANGS 1 DAYLIGHT LIMIIII'I'ED, OF VANCOUVER, CANADA.

LAMP mmczron.

Application filed Kay 14, 1923, Serial 1T6. 638,874. Renewed 0ctob'er 21, 1926.

This invention relates to a light reflector for an incandescent lamp and is designed to obtain an effective reflection of the light rays in one direction without the require ment of a reflector of large diameter.

In the usual reflector the required area of reflecting surface is generally obtained by a concave reflecting surface of considerable diameter.

In the device, which is the subject of this application, thereflecting surface, instead of ing extended laterally outward, is projectedforward around in a succession of annular surfaces which are alternate] reversely coned, or preferabl alternate y concave and conical.

ith. this arrangement the backwardly directed rays from the lamp are projected forward from the forwardly directed conical or concave surfaces, and such of the forwardly directed rays as are intercepted by the reflector are projected backward from the backwardly directed conical surfaces on a to the forwardly directed conical or concave surfaces to be projected forward by them.

The curvature of the annular concave surfaces is such as will reflect the rays forward clear of the lamp filament, whereby the shadow of the filament is avoided and a fairl uniform distribution of the light over the esired area is attained.

The invention is particularly described in the following speci cation, reference being made to the drawings by which it is accompanied, in which:

Fig. 1 is a vertical longitudinal section of the reflector in the plane of the axis of the bulb.

Fig. 2 isa modification to suit a different position of the lamp bulb, and

fig. 3 is a development showing how the concave reflecting surfaces may have wave like corrugations.

In these drawings 2 represents the bead by which the reflector is connected to its support. From this bead 2 a concave, annular surface 3 extends laterally outward for a short distance, dependent on the space desired or available From the outer edge of the annular concave surface 3, the reflecting surface conver s in an annular conical frustrum 6, the

wi th of which is approximately one-sixth .the diameter of the outer edge of thesurface 3, and the apex of the cone of which this the axis of the lamp axis of the reflector ap roximately that of the major diameter of, e ridges, the circles,

formed byithe inner an les of the connected rides being substantia ye ual.

he concavityof the sur aces 3, 8 is designed to reflect the rays of light which fall upon t from the lamp 4 outward at an angle that will avoid interference with the filament 5 of the lamp, so that the shadow of the filament will not be reflected on the bowl of the lamp wheresuch is used or on the surface'to be illuminated.

The required reflecting area is thus obtained by producing the reflector in a series of circum erential rid surrounding the axis of the lam ,insteafi it being extended laterally there rom.

ere, the lam flector, t

is placed further 'within; the ree angle which the annular concave surfaces make with the annular conical surfaces is more obtuse, that is, the curvature of the concave surfaces is-of smaller radius and the conical surfaces assuch are more acute.

In order to more effectively disperse the light rays, the concave reflecting surfaces 3, 8 may be corrugated or waved, asshown in Fig. 3, without departing from the spirit of the invention. v

The reflector is particiilarly effective and may be applied to many purposes other than that for which it was originally designed,

viz, to pass within the restricted aperture of thesemi-opaque glass bowls which are in common use for ighting purposes, and where a reflector of the ordinary" form cannot be applied.

Further, the reflection may or colour-tinted glass with the silvering applied to the outer side, that the light from the lamp may be modified in" passing through the glass to and from the reflecting surface of the outer side. Where silvered glass on the outside is used, the refraction of the light rays in passing through the glass to and from the reflecting surface, must be as shown in Fig. 2, the bulb of-v be from a polished inner surface or" may be of clear allowed for in considerin the curvatures of the surfaces 3 and 8 an the angle which the conical surfacesmake with them..

It will be noticed from the drawing that the rays of light which strike'the reflecting surfaces on one side of the reflector are reflected outward on the opposite side of the lamp axis,'and with care in selecting "the curvature of the reflecting surfaces 3 and 8 a substantially uniform distribution of the light may be obtained at any desired' distance from the reflector.

It will be observed from the drawings that the centers of curvature of the frusto-conical surfaces 3 and 8 are on different centers alon the direction of the lon 'tudinal axis of the reflector and are not al struck from the same center.

Having now particularly described my invention, I hereby declare that what I claim asne'w and desire to be protected in by Letters Patent, is:

1. A tubular shaped light reflector,com-

rising a body having a neck and a plurallty of co-axially arranged annular frustospherical reflecting surfaces having their centers of curvature arranged at difl'erent poinsts along the direction of the longitudinal'axis of the reflector, said reflecting 0 surfaces being connected by annular coreflectors and interceptin havin a neck and having an interior surface 0 reflecting color-tinted glass and having'a plurality of co-axially arranged frustospherical reflectors having their centers of. curvature arranged s aced along the direction of the longitu inal axis of saidreflector and co-a'xia-lly arran ed frusto-oonical reflectors connecting sai and reflecting certain rays of'light against, said frustospherical reflectors for reprojection' by the latter out ot'said light reflectors.

3. A reflector comprisin abody provided with a neck and terminat ng in a plurality spherical reflectors struck from, different centers arranged along the direction of the reflector comprising a body.

frusto-spherical y of co-axiallv arranged superposed frustolongitudinalaxis of the reflector and connected by inwardly inclined reversely. disposed annular reflectln surfaces adapted to intercept and reflect t e light rays upwardly and inwardly against said frusto-sphericalreflectors, the perimeter-s of said reflectors being of substantially uniform diameter substantially as specified. i

In testimony whereof I .afiix m signature.

' NIEL LANG.

- ical surfaces allowed for in considerin the curvatures of the surfaces 3 and 8 an the angle which the conical surfaces make with them.

It will be noticed from the drawing that the rays of light which strike the reflecting surfaces on one side of the reflector are reflected outward on the opposite side of the lamp axis, and with care in sclectingthe curvature of the reflecting surfaces 3 and 8 a substantially uniform distribution of the light may be obtained at any desired" distance from the reflector.

It will be observed from the drawings that the centers of curvature of the frusto-con- 3 and 8 are on different centers along the direction of the lon itudinal axis of the reflector and are not al struck from the same center.

Having now particularlyl described my invention. I hereby declare t at what I claim as new and desire to be protected in by Letters Patent, is:

l. A tubular shaped light reflector, comprising a body having a neck and a pluraL ity of co-axially arranged annular frustospherical reflecting surfaces having their (enters of curvature arranged at different poinsts along the direction of the longitudinal axis of the reflector, said reflecting surfaces being connected by annular coaxially arranged reversely disposed reflecting surfaces.

2. A light reflector comprising a body.

having a neck and having an interior surface of reflecting color-tinted glass and having a lurality of co-axially arranged frustospherical reflectors having their centers of curvature arranged spaced along the direction of the longitudinal axis of said reflector and co-axially arranged frusto-conical reflectors connecting said frusto-spherical reflectors and intercepting and reflecting certain rays of light against said frustospherical reflectors for reprojection by the latter out ot'said light reflectors.

3. A reflector comprising a body provided with a neck and terminating in a plurality of co-axially arranged superposed frustospherical reflectors struck from different centers arranged along the direction of the longitudinal axis of the reflector and connected by inwardly inclined reversely disposed annular reflecting surfaces adapted to intercept and reflect the light rays upwardly and inwardly against said frusto-spherical reflectors, the perimeters of said reflectors being of substantially uniform diameter substantially as specified.

In testimony whereof I affix m signature.

NIEL LANG.

CERTIFICATE OF CORRECTION.

Pa tent No. 1, 62 5, 948.

ing correction as follow words "2 Sheets-Sheet l" NIELS LANG.

it is hereby Granted April 26, 1927, to

certified that error appears in the above numbered patent require: In the heading to the drawing,

line 3; strike out the and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed tbie 17th day of May, A. D. 1927.

Sell.

M. J. Moore, Acting Commissioner of Patents.

CERTIFICATE or CORRECTION.

Pltent No. 1,62S,94 8.' Granted April 26, 1927, to

NIELS LANG.

It is hereby certified that error appears in the above numbered patent requiring correction as follows: In the heading to the drawing, line 3, strike out the words 2 Sheets-Sheet l"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the ease in the Patent Office. I

Signed and sealed this 17th day of May, A. D. 1927.

M. J. Moore, Acting Commissioner of Patents. 

